Engraving-machine.



l PATENTED 'MAY 31, 1904.

M. BARR.

ENGRAVING MACHINE.

APPLIOAVTIOVH FILED SEPT. 28, 1699.

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N0; 761;a49. Y PATENTBD MAY a1, 1904. M. BAR-R.

BNGRAv-ING MACHINE;

APPLICATION FILED SEPT. 28,1899.

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UVESSILS: f/ZQW Patented May 31, 1904.

MARK` BARR, OF BROADHEATIL ENGLAND, ASSIGNOR TO THE LINOTYPE COMPANY, LIMITED, OF LONDON, ENGLAND'. -v

ENGRAVING-MACHINE.

` SPECIFICATION forming 4part of Letters Patent'No. I761,349, dated May 31, 1904.

.Application led September 28,1899. Serial No. 731,928. (No model.)

To L7/Z whom t nza/y cm1/cern: 4 l

Be it known that I, MARK BARR, ofBroadheath,`in the county of Chester, England', have invented certain new and useful Improvements lin Engraving-Machines; and I do hereby deelare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to makevand use thesame.

The present" invention relates to improvements in pantograph engraving-machines the Itracer-rod land tool of which are constantly vertical. In carrying it into effect the tracer is made capable of4 a reciprocating vertical motion, and a like vertical motion at the work end of the machine is provided for,of which either the tool or the work-table is capable, both such motions being provided by the improved means hereinafter described and illust'rated.v The term vwork end of the machine is used to indicate that end of it where the tool and work cooperate. This coperation is as heretofor'e. It is immaterial for the 1 purpose thereof whether the tool moves overthe work or whether the work ismoved past the tool.

The means 'by which the above-mentioned like vertical motion at the working end of the machine is secured may vfor the purpose of work-table-has not the capacity for reeiproeating vertical motion has a horizontal Inotion in any direction, thus constituting it the horizontally-moving member at the work end of the machine. Such horizontal motion is likewise guided by a similar' special guide. The pantograph is connected to the tracer and to the horizontally moving member at thev Work end of the machine. ,The reciprocating vertical motion of the tracer is ltransmitted in the proper proportion to the tool throughy a the tracer 13.

said motion by the four posts k9 by means of that number of lugs 11, projecting diagonally .vertical motion of the tracer.

lever which has its fulcrum adjustable for ratio i between the respective depths of the pattern and work and is pivotally connected to both elevation illustrating the invention constructed with a horizontally-moving Work-table.

Referring rst to Figs. 1 and 2, lis the base; 2, the pattern; 3, an elevated part thereon; 4, a standard held to the base 1 by screws 5 screwed down thereinto througha iiange 7 8 8v, a pair of parallel arms standing out horiizontally from the top of the standard 4in the carry posts 9 9, Whose function is to act as a fixed guide forthe vertical motion of the guide 1() of the horizontal guide-plate 12. 'The arms 8 8 stand apa-rt from each other far enough to allow of thehorizontal motion of This guide 10 is guided in'its from each of its corners and perforated to pass over the said posts and to slide freely up land down them; The height ofthe posts 9-9.l

must be'suflicient to allow of the maximum' The horizontal guide-plate 12 is capable of a horizontal motion lin any direction.

13 is the tracer.

Passing now to the work end of the machine,

14 is the Work-table, 15 the Work held down upon it by any suitable means, and 16 apro- It is made fast centrally to the underside of the-guide-plate 12, fromlwhich it depends vertically between the arms -8 8. i

jection upon it corresponding, respeetively,

with the pattern 2 and the projection' 3.

' 17 is a standard fixed to the base 1 by flange 18 and screws 19 in the same way as the stand-l ard 4, -already described.

20 20'are a pair of parallel armsv standing each other far enough toallow of the lateral motion of the tool. rlhis guide 22 is guided in its said motion by the four posts 21 by means of as many lugs 24, projecting diagonally from each of its corners and perforated to pass over them, respectively, and to slide freely up and down them. The height of the posts 21 must be sufcient to allow of the maximum vertical motion of the tool.

23 is the horizontal guide-plate of the tool. 1t is capable of a horizontal motion in any direction proportionate 'to the motion of the tracer in the same direction.

25 is the tool-post.

26 is the tool carried by the bottom end of the post 25 and capable of rotation therein about an axis common to them both by means of a driving-band passed around the pulley 27, fast to the tool. This combination of toolpost 25, tool 26, driving-pulley 27, and band is of the usual description. Both guides 1() and 22 have openings 28 in them of corresponding areas to allow of the horizontalmetions of the tracer 13 and the tool-post 25, respectively.

30 is the lever connecting the two guideplates 10 and 22, and 31 is its fulcrum. It is connected to the guide 10 of the tracer 13 by a pivot-joint 32, having a horizontal axis on the top of a post 33, standing up from the center of the top of the said guide 10, to Vwhich it is made fast, and to the guide 22 by a similar pivot-joint 34 on the top of a post 35, standing up from the center of the top of the said guide 22. The fulcrum 31 is a universal joint on the top of a post 36. This fulcrum 31 is `fixed for any given length of the lever 30 between it and the pivot 32; but it is adjustable horizontally for ratio between the respective depths of the pattern and the work in the direction of its own length along a guiding-groove 37 in a bracket 38,-project ing from the standard 17.

39 is a scale on the top of the bracket 38 to guide the operator in adjusting the position of the fulcrum 31, and 44 is a set-screw for holding the fulcrum in its adjusted position. To allow of the variations in the height of the fulcrum 31 above the bracket 33, due to the varying position of the fulcrum 31 along the said bracket, the post 36 is adjustable vertically in a socket 40, in which it can be fixed at any height by a set-screw 41. It is therefore the socket 40, acting as the foot of the post 36, that engages directly in the groove 37.

42 is a telescopic joint in the length of the lever 30 between the fulcrum 31 and the pivot-joint 34, and 43 is a second one between the said pivot-joint 34 and the pivot-joint 32 to compensate for the variations in the length of the lever 30 which will occur with the reciprocating vertical motion of the two pivotjoints 34 and 32.

45 is a pantograph connecting the tracer 13 and the tool-post 25. Any suitable type of pantograph may be used. The invention imposes no limit in that respect. It requires only that the pantograph connect the tracer and the horizontally-moving member at the work end of the machine-the tool in the construction being described-to each other directly.

Vr1`he action of the invention constructed as above described is as follows: The pantograph 45 is iirst adjusted and then the position of the fulcrum 31, both for the desired ratio between the pattern 2 and the work 15. So long as the tracer 13 has only to more over the pattern 2 in the horizontal plane its motion is communicated, through the pantograph 45, to the tool-post 25, the motions ol'I both tracer 13 and tool-post being steadicd by the respective guide-plates 12 and 23, and the lever 30 automatically shortening and lengthening itself accordingly, as the pivot-joints 32 and 34 reciprocate vertically; but when the contour of the pattern 2 requires the point oi the tracer 13 to rise, as would bethc ca'se when it came to deal with a projection, such as 3, the guide-plate 12 pushes the guide l() up the guide-posts 9,carrying the pivot-joint32 vertically upward with it. The fulcrum 31 ofthe lever 30 being held against vertical motion by its connection to the bracket 38, the arcual motion ofthe lever 30 upward pulls the pivotjoint 34 upward for a corresponding distance, according to the ratio between pattern and work established by the above-described adjustment of the pantograph 45 and lever 30. The upward motion of the pivot-joint 34 must be vertical because of the engagement of the posts 21 in the lugs 24 and is shared by the tool 26. Vhen the point of the tracer 13 is dealing with the horizontal top of the projection 3, the machine works as with any other horizontal surface. lVhen it has to descend one of the sides of the said projection 3, the two guides 10 and 12 are moved vertically downward, the former by the descent of the tracer 13 and the latter by the descent of the lever 30. r1`he pantograph 45 always moves up and down with the tracer 13 and the tool-4 post 25.

The projection 3 is shown as rectangular in cross-section to the better illustrate thesequence lof horizontal and vertical motions on the part of the tracer and tool and of the connecting members of the machine. .In actual practice the contours will be convex and concave; but as any curved line is under the circumstances of engraving a certain compound of vertical and horizontal components the 111etions of the tracer 13 and the tool-post 25 will each be a similar compound, the pantograph IOO invention remains exactly the same as in the construction just described. There are the same functions and the same means for enabling the machine to discharge them, the only difference being the transference of the tools capacity for lateral motion to the work-table.VV

For that reason those organs in Fig. 3, which are the counterparts in all respects of organs in Figs. 1 and v2, are marked with the same referencel and need no further description, while those whichl are affected by the dierence above mentioned are marked with the same references with a superior a added.

MZ is the work-table; 222, the guidefor the guide-plate 23; 50, a vertical post holding the said guide-plate and work-table fast together, and 28 the opening to allow of the horizontal motion of the said post. The respective organ of the pantograph i-5 is connected to the post 50 to move the work-table 14K. The toolpost 257' has a vertical motion in a single central arm 20, which serves as its guide. Thus the horizontal motions of the tracer 13 are transmitted by the pantograph 4:5 to the work end of the machine in exactly the same way and with the same effect on the combination of tool 26 and work 15 as in Figs. 1 and 2.

1. The. combination in an engraving-machine, of horizontally-moving member at the work end of the machine; pantograph connecting the tracer with the said member; tracer capable of vertical motion; tool capable of vertical motion; fixed guides adapted to direct the vertical motions of the tracer and tool respectively; special guide for the horizontal motion of the tracer, consisting of a horizontal guide-plate to which the sai'd tracer is made fast, and a guide in which the guide-plate is capable of horizontal motion in anyT direction;

a like special guide for the horizontal motion of the horizontally-moving member at the work end of the machine; and lever having a fulcrum adjustable for ratio between the depths of the pattern and the work, telescopic joints in its length to compensate for variations therein, and pivotal connections to the tracer and to the vertically-moving member at the work end ofl the machine.

2. The combination in an engraving-machine, of pantograph connecting the tracer with the tool; tracer capable of verticalmotion'; tool capable of vertical motion; iiXed guides adapted to direct the vertical motions of the tracer and tool respectively; special guide for the horizontal motion of the tracer, consisting of horizontal guide-plateto which thesaid tracer is made fast, and a guide in which the guide-plate is capable of horizontal motion in any direction;' a like special guide for the horizontal motion of the tool; and 1ever having a fulcrum adjustable for ratio between the depths of the pattern and the work,

telescopic joints in its length to compensate` for variations therein and pivotal connections to the tracer and to the tool. l

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.l

MARK BARR. 

